cchost.config: add baked in command line

The exact command line value we want at this point is not known yet, so
fill it with a placeholder. The placeholder is intended to be very high
entropy to give us flexibility when we edit the bzImage in-place later.

BUG=b/465210631
TEST=presubmit
RELEASE_NOTE=None

Change-Id: I01f64b014d42dd0df672cce6cc6dbafe774a295f
Signed-off-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/143664
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
Reviewed-by: He Gao <hegao@google.com>